when dr. king spoke of his dream at the feet of lincoln. before that they were jailed in jackson, mississippi as defiant freedom riders risking life, limb and liberty for the cause of civil rights. and four years ago they were in tears as barack obama fulfilled the dream. >> it was just joyous. >> reporter: here they were again today, living proof of how far america can come in one lifetime. and like much of the crowd they were more subdued and reflective than they were during the first oath. >> every president has shortcomings and all have great hopes and dreams going into it and the cold hard reality of washington politics hits. >> what stories do you tell from this era to help kids understand how big this is. >> we went from this to this in your lifetime. >> the young persons found a cause and a reason to do what we did. there are causes that they, too, can find. >> what do you say to the 47% of americans who voted the other way? >> there are many points that we can all agree on. let's find those and work from there.